3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = ['A1', 'A2', 'A3', 'A4', 'A5', 'A6', 'A7', 'A8', 'A9']; $b = ['B1', 'B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B8', 'B9']; $afterEvery = 2; $insertCount = 1; for ($i = 0, $count = count($b); $i < $count; ++$i) { array_splice( $a, # the array to be modified $afterEvery + $afterEvery * $i + $insertCount * $i, # each iteration must account for previously inserted elements 0, # do not consume any elements from $a array_slice($b, $i * $insertCount, $insertCount) # push array of element(s) into $a ); } var_export($a); /* insert 2 after every 1 every + (every * i) + (insert * i) 0 (insert @ 1) ... A B B A A A A A A A A A A 1 + (1 * 0) + (2 * 0) = 1 1 (insert @ 4) ... A B B A B B A A A A A A A 1 + (1 * 1) + (2 * 1) = 4 2 (insert @ 7) ... A B B A B B A B B A A A A 1 + (1 * 2) + (2 * 2) = 7 3 (insert @ 10) ... A B B A B B A B B A B B A 1 + (1 * 3) + (2 * 3) = 10 */ /* insert 1 after every 2 every + (every * i) + (insert * i) 0 (insert @ 2) ... A A B A A A A A A A A A A 2 + (2 * 0) + (1 * 0) = 2 1 (insert @ 5) ... A A B A A B A A A A A A A 2 + (2 * 1) + (1 * 1) = 5 2 (insert @ 8) ... A A B A A B A A B A A A A 2 + (2 * 2) + (1 * 2) = 8 3 (insert @ 11) ... A A B A A B A A B A A B A 2 + (2 * 3) + (1 * 3) = 11 */ /* insert 1 after every 3 every + (every * i) + (insert * i) 0 (insert @ 3) ... A A A B A A A A A A A A A 3 + (3 * 0) + (1 * 0) = 3 1 (insert @ 7) ... A A A B A A A B A A A A A 3 + (3 * 1) + (1 * 1) = 7 2 (insert @ 11) ... A A A B A A A B A A A B A 3 + (3 * 2) + (1 * 2) = 11 3 (insert @ 15) ... A A A B A A A B A A A B A 3 + (3 * 3) + (1 * 3) = 15 */ /* insert 3 after every 2 every + (every * i) + (insert * i) 0 (insert @ 2) ... A A B B B A A A A A A A A 2 + (2 * 0) + (3 * 0) = 2 1 (insert @ 7) ... A A B B B A A B B B A A A 2 + (2 * 1) + (3 * 1) = 7 2 (insert @ 12) ... A A B B B A A B B B A A B 2 + (2 * 2) + (3 * 2) = 12 3 (insert @ 17) ... A A B B B A A B B B A A B 2 + (2 * 3) + (3 * 3) = 17 */

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
8.3.60.0040.01116.75
8.3.50.0170.00318.31
8.3.40.0100.00720.13
8.3.30.0070.00718.72
8.3.20.0000.00724.18
8.3.10.0040.00424.66
8.3.00.0050.00226.16
8.2.180.0160.00325.92
8.2.170.0070.00718.95
8.2.160.0140.00022.96
8.2.150.0040.00425.66
8.2.140.0080.00024.66
8.2.130.0040.00426.16
8.2.120.0070.00019.82
8.2.110.0080.00319.27
8.2.100.0060.00617.91
8.2.90.0080.00017.63
8.2.80.0080.00018.79
8.2.70.0080.00017.50
8.2.60.0050.00317.93
8.2.50.0090.00018.07
8.2.40.0030.00518.04
8.2.30.0050.00318.11
8.2.20.0000.00719.24
8.2.10.0040.00418.15
8.2.00.0030.00619.21
8.1.280.0100.00325.92
8.1.270.0070.01423.52
8.1.260.0080.00026.35
8.1.250.0090.00028.09
8.1.240.0030.00619.09
8.1.230.0070.00420.94
8.1.220.0080.00018.69
8.1.210.0050.00318.77
8.1.200.0000.00817.22
8.1.190.0080.00017.22
8.1.180.0040.00418.10
8.1.170.0000.00818.71
8.1.160.0000.00718.87
8.1.150.0030.00618.63
8.1.140.0040.00417.35
8.1.130.0020.00518.87
8.1.120.0050.00217.34
8.1.110.0030.00517.41
8.1.100.0050.00517.34
8.1.90.0130.00417.47
8.1.80.0150.00317.46
8.1.70.0150.00317.39
8.1.60.0120.00817.55
8.1.50.0160.00317.38
8.1.40.0180.00017.50
8.1.30.0050.01517.55
8.1.20.0180.00317.55
8.1.10.0140.00517.55
8.1.00.0170.00317.35
8.0.300.0070.00018.77
8.0.290.0030.00516.75
8.0.280.0080.00018.44
8.0.270.0000.00716.71
8.0.260.0000.00618.39
8.0.250.0030.00316.98
8.0.240.0030.00616.81
8.0.230.0000.00916.88
8.0.220.0120.00316.82
8.0.210.0090.00916.67
8.0.200.0160.00016.81
8.0.190.0170.00016.90
8.0.180.0130.00616.83
8.0.170.0140.00316.78
8.0.160.0080.00816.90
8.0.150.0130.00316.80
8.0.140.0120.00516.82
8.0.130.0110.00816.86
8.0.120.0120.00716.84
8.0.110.0110.00716.72
8.0.100.0150.00316.79
8.0.90.0180.00016.78
8.0.80.0170.00016.85
8.0.70.0090.00916.81
8.0.60.0160.00316.73
8.0.50.0130.00516.88
8.0.30.0050.01416.72
8.0.20.0160.00516.96
8.0.10.0090.00916.96
7.4.330.0000.00515.55
7.4.320.0030.00316.55
7.4.300.0090.00716.56
7.4.290.0160.00316.52
7.4.280.0190.00016.51
7.4.270.0170.00216.43
7.4.260.0170.00316.52
7.4.250.0140.00516.61
7.4.240.0180.00316.49
7.4.230.0100.00816.45
7.4.220.0160.00316.57
7.4.210.0040.01316.63
7.4.200.0190.00016.60
7.4.190.0070.01116.73
7.4.180.0120.00616.64
7.4.160.0130.00316.55
7.4.150.0130.00316.41
7.4.140.0160.00016.43
7.4.130.0100.00216.34
7.4.120.0130.00416.41
7.4.110.0050.01216.52
7.4.100.0150.00316.36
7.4.90.0080.00916.39
7.4.80.0130.00516.34
7.4.70.0130.00216.44
7.4.60.0090.01016.44
7.4.50.0190.00016.27
7.4.40.0140.00316.29
7.4.30.0190.00016.54
7.4.20.0120.00316.44
7.4.10.0070.01016.56
7.4.00.0130.00416.55

preferences:
53.08 ms | 400 KiB | 5 Q